Harman Kardon HD 990, Service Manual

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HS0038B
Vishay Telefunken
1 (7) Rev. 7, 05-Dec-00
www.vishay.com
Document Number 82002
Photo Modules for PCM Remote Control Systems
Description
The HS0038B – series are miniaturized receivers for
infrared remote control systems. PIN diode and
preamplifier are assembled on lead frame, the epoxy
package is designed as IR filter.
The demodulated output signal can directly be
decoded by a microprocessor. HS0038B is the
standard IR remote control receiver series, supporting
all major transmission codes.
14 500
Features
D
Photo detector and preamplifier in one package
D
Internal filter for PCM frequency
D
TTL and CMOS compatibility
D
Output active low
D
Improved shielding against electrical field
disturbance
D
Suitable burst length
≥
10 cycles/burst
D
Low power consumption
D
High immunity against ambient light
D
Continuous data transmission possible
(800 bit/s)
Block Diagram
9612226
PIN
Input
AGC
Control
Circuit
Band
Pass
Demodu-
lator
30 k
W
2
3
1
V
S
OUT
GND
HD 990
harman/kardon